http://gunlab.net/in-the-white-ar-180b-upper-receiver/ Adventures in gun building! Sat, 11 Apr 2026 23:49:22 +0000 hourly 1 https://wordpress.org/?v=4.1.41 http://gunlab.net/in-the-white-ar-180b-upper-receiver/#comment-11263 Mon, 27 Jul 2015 01:16:06 +0000 http://gunlab.net/?p=3851#comment-11263 It should fit an original receiver it does not have the capability to install a trip sear that would be required for a full auto. This is a semi auto upper receiver only.

]]> http://gunlab.net/in-the-white-ar-180b-upper-receiver/#comment-11261 Mon, 27 Jul 2015 00:28:55 +0000 http://gunlab.net/?p=3851#comment-11261 Would this lower receiver fit a original Armalite AR-18 and make it semi auto instead of full auto?

]]> http://gunlab.net/in-the-white-ar-180b-upper-receiver/#comment-11195 Tue, 21 Jul 2015 20:11:08 +0000 http://gunlab.net/?p=3851#comment-11195 They were not pinned.
I am not sure that the AR-15 trunnion was even turn down. I am working on solid models of the two parts to determine if that is the case or not.

]]> http://gunlab.net/in-the-white-ar-180b-upper-receiver/#comment-11191 Tue, 21 Jul 2015 15:24:42 +0000 http://gunlab.net/?p=3851#comment-11191 My research indicates that the AR15 barrel extension was turned down, pressed into the trunion, then pined in place before being be welded into the upper. I have been unable to determine if the pinning part is accurate or not but I do know that if you do not use a reaction wrench to hold the extension when removing the barrel and simply clamp the flats of the receiver, the extension will turn inside the trunion. Without drawings or a 180B trunion by itself, we may never know for sure. Maybe there is a demilled upper floating around somewhere.

]]> http://gunlab.net/in-the-white-ar-180b-upper-receiver/#comment-11178 Mon, 20 Jul 2015 10:53:41 +0000 http://gunlab.net/?p=3851#comment-11178 Well this is exciting! Waiting impatiently for the AR16… Very impatiently.

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